Shark knife



FIG. 1 is a perspective view of the shark knife;

FIG. 2 is a left side view thereof;

FIG. 3 is a right side elevation view thereof.

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a front elevation view thereof; and,

FIG. 7 is a rear elevation view thereof. 

The ornamental design for a shark knife, as shown and described. 